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- W2063487191 abstract "This study was designed to determine the disposition of bupivacaine and its metabolites in the maternal, placental, and fetal compartments, using multiple sampling time points in chronically prepared awake pregnant rats.All animals received an intravenous infusion of bupivacaine at a rate of 0.33 mg. kg-1. min-1 over a period of 15 min. The fetuses were delivered either at the end of infusion or at 2 or 4 h after dosing. Maternal and fetal blood and tissue samples were obtained for the assays of bupivacaine and its metabolites using capillary gas chromatography-mass spectrometry.The elimination half-life of bupivacaine was 37.7 min. The major metabolite was 3'-hydroxybupivacaine. Bupivacaine and 3'-hydroxybupivacaine were present in all samples at the end of administration. The fetal to maternal concentration ratio of bupivacaine in plasma was 0.29, and in the placenta was 0.63. The amnion contained the highest bupivacaine concentration: threefold higher in the maternal and 11-fold higher than in the fetal plasma. At 4 h after dosing, bupivacaine was no longer detectable in any maternal and fetal samples, whereas 3'-hydroxybupivacaine was still present in all tissues except the fetal plasma and heart.These data indicate that a considerable amount of bupivacaine is taken up by both sides of the placenta, as well as the amnion and myometrium. 3'-Hydroxybupivacaine was present in all tissues except the fetal plasma and heart samples, even after the parent compound became no longer detectable. Whether this slow elimination of 3'-hydroxybupivacaine causes any adverse effects on the fetus-newborn needs to be explored." @default.
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- W2063487191 date "2000-10-01" @default.
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- W2063487191 title "Disposition of Bupivacaine and Its Metabolites in the Maternal, Placental, and Fetal Compartments in Rats" @default.
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- W2063487191 doi "https://doi.org/10.1097/00000542-200010000-00031" @default.
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